However New Zealand farmers argue that taxpayers should pay for the research, because reducing the emissions benefits everyone.

"This decision is yet another example of the government's desire to act in the wider public interest but expecting rural New Zealand to pay for its largesse," Federated Farmers President Tom Lambie said.

Sheep, cattle, goats and deer produce large quantities of gas through belching and flatulence, as their multiple stomachs digest grass.

Ruminants are responsible for about 25% of the methane produced in Britain.

In countries with a large agricultural sector, the proportion is much higher. In New Zealand, farm animals produce 90% of methane emissions.